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Pattern and Amount of Change of Upper Front Teeth After Retention with a Bonded Retainer 2010 G

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Pattern and Amount of Change of Upper Front Teeth After Retention with a Bonded Retainer 2010 G View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Göteborgs universitets publikationer - e-publicering och e-arkiv Sa Pattern and amount of change of san Na ra upper front teeth after retention ghi Patt with a bonded retainer er n a nd Follow-up one to seven years postretention a mount of cha n ge of upper fr ont t e eth af ter r ete ntion with a bonde d r etai ner Sasan Naraghi Institute of Odontology at the Sahlgrenska Academy University of Gothenburg 20 ISBN 978-91-633-7846-1 10 Printed by Intellecta Infolog, Gothenburg Pattern and amount of change of upper front teeth Pattern and amount of change of upper front teeth after retention with a bonded retainer after retention with a bonded retainer Follow-up one to seven years postretention Follow-up one to seven years postretention Sasan Naraghi Sasan Naraghi Department of Orthodontics Department of Orthodontics Institute of Odontology at the Sahlgrenska Academy Institute of Odontology at the Sahlgrenska Academy University of Gothenburg University of Gothenburg 2010 2010 To my beloved family Peggy, Jasmin and Shirin To my beloved family Peggy, Jasmin and Shirin To my dear brother Sirus who has been my leading star To my dear brother Sirus who has been my leading star and a source of inspiration in my life and a source of inspiration in my life © Sasan Naraghi, 2010 © Sasan Naraghi, 2010 ISBN 978-91-633-7846-1 ISBN 978-91-633-7846-1 Printed by Intellecta Infolog AB, Göteborg 2010 Printed by Intellecta Infolog AB, Göteborg 2010 CONTENTS CONTENTS PREFACE 7 PREFACE 7 ABSTRACT 8 ABSTRACT 8 POPULÄRVETENSKAPLIG SAMMANFATTNING 10 POPULÄRVETENSKAPLIG SAMMANFATTNING 10 INTRODUCTION 12 INTRODUCTION 12 AIMS 23 AIMS 23 MATERIALS AND METHODS 24 MATERIALS AND METHODS 24 RESULTS 30 RESULTS 30 DISCUSSION 33 DISCUSSION 33 CONCLUSIONS 38 CONCLUSIONS 38 ACKNOWLEDGMENTS 39 ACKNOWLEDGMENTS 39 REFERENCES 40 REFERENCES 40 PAPER I 47 PAPER I 47 PAPER II 57 PAPER II 57 PREFACE PREFACE This thesis is based on the following two papers, which are referred to as This thesis is based on the following two papers, which are referred to as paper I and paper II. paper I and paper II. Paper I. Naraghi S, Andrén A, Kjellberg H, Mohlin B. Relapse tendency Paper I. Naraghi S, Andrén A, Kjellberg H, Mohlin B. Relapse tendency after orthodontic correction of upper front teeth retained with a bonded after orthodontic correction of upper front teeth retained with a bonded retainer. Angle Orthod. 2005;76: 570–576. retainer. Angle Orthod. 2005;76: 570–576. Paper II. Andrén A, Naraghi S, Mohlin B, Kjellberg H. Pattern and Paper II. Andrén A, Naraghi S, Mohlin B, Kjellberg H. Pattern and amount of change after orthodontic correction of upper front teeth 7 years amount of change after orthodontic correction of upper front teeth 7 years postretention. Angle Orthod. 2010;80:620–625. postretention. Angle Orthod. 2010;80:620–625. These papers are reprinted with the kind permission from the copyright These papers are reprinted with the kind permission from the copyright holder, Angle Orthodontist. holder, Angle Orthodontist. 7 7 ABSTRACT ABSTRACT Objectives: Objectives: To investigate the amount and pattern of relapse of maxillary front teeth To investigate the amount and pattern of relapse of maxillary front teeth previously retained with a bonded retainer for two to four years. Which previously retained with a bonded retainer for two to four years. Which teeth are more prone to relapse? Is there any difference in behavior teeth are more prone to relapse? Is there any difference in behavior between contact point displacement and rotation? What is the magnitude of between contact point displacement and rotation? What is the magnitude of the relapse in short-term and long-term? the relapse in short-term and long-term? Materials and Methods: Materials and Methods: The study group originally consisted of 45 patients, and 27 patients on The study group originally consisted of 45 patients, and 27 patients on recall for the second study. Recordings from study models before treatment recall for the second study. Recordings from study models before treatment (T1), at debonding (T2), one year after removal of the retainer (T3) and (T1), at debonding (T2), one year after removal of the retainer (T3) and seven years postretention (T4) were present. All patients had been treated seven years postretention (T4) were present. All patients had been treated with fixed edgewise appliances by the same operator. The irregularity with fixed edgewise appliances by the same operator. The irregularity index (sum of contact point displacement [CPD]), and rotations of front index (sum of contact point displacement [CPD]), and rotations of front teeth in relation to the Raphe line and intercanine distance, were calculated teeth in relation to the Raphe line and intercanine distance, were calculated at T1, T2, T3 and T4. at T1, T2, T3 and T4. Statistical analysis: Statistical analysis: Paired t-test, Pearson’s product-moment correlation and Pearson’s product- Paired t-test, Pearson’s product-moment correlation and Pearson’s product- moment correlation coefficient were applied. For all statistical analyses, the moment correlation coefficient were applied. For all statistical analyses, the statistical significance level was set to 5%. statistical significance level was set to 5%. Results: Results: Before treatment (T1), the mean irregularity index was 10.1 (range 3.0– Before treatment (T1), the mean irregularity index was 10.1 (range 3.0– 29.9). The largest displacements were recorded between laterals and 29.9). The largest displacements were recorded between laterals and centrals followed by the displacement between laterals and canines. The centrals followed by the displacement between laterals and canines. The smallest deviations were found between the centrals. smallest deviations were found between the centrals. After treatment (T2), the mean irregularity index was 0.7 (range 0.0–2.1). After treatment (T2), the mean irregularity index was 0.7 (range 0.0–2.1). There was a significant difference in the index between T1 and T2 (P There was a significant difference in the index between T1 and T2 (P <.0001). <.0001). One year postretention (T3), the mean irregularity index was 1.4 (range 0– One year postretention (T3), the mean irregularity index was 1.4 (range 0– 5.1). There was a significant difference in the index between T2 and T3 (P 5.1). There was a significant difference in the index between T2 and T3 (P <.0001). <.0001). Results from the second study showed that there were no statistically Results from the second study showed that there were no statistically significant differences between the change in mean CPDs for the contacts significant differences between the change in mean CPDs for the contacts canines/laterals, laterals/centrals, or centrals/centrals. The mean irregularity canines/laterals, laterals/centrals, or centrals/centrals. The mean irregularity 8 8 index for the 27 patients examined in the second study was 10.3 (range 3.7- index for the 27 patients examined in the second study was 10.3 (range 3.7- 29.9) at T1, 0.9 (range 0.0-2.1) at T2, 1.3 (range 0.0-3.5) at T3 and 2.0 29.9) at T1, 0.9 (range 0.0-2.1) at T2, 1.3 (range 0.0-3.5) at T3 and 2.0 (range 0.0-5.8) at T4. (range 0.0-5.8) at T4. No correlations were found between the pretreatment and postretention No correlations were found between the pretreatment and postretention irregularity T1/T3 and T1/T4. There was a significant association between irregularity T1/T3 and T1/T4. There was a significant association between the irregularity index at T3 and T4 (R = 0.938, P < .0001). the irregularity index at T3 and T4 (R = 0.938, P < .0001). The irregularity index of the maxillary front teeth changed very little or not The irregularity index of the maxillary front teeth changed very little or not at all during the first year postretention. Further changes long-term resulted at all during the first year postretention. Further changes long-term resulted in an irregularity index of mean 2.0 mm (range 0.0 – 5.8). The contact in an irregularity index of mean 2.0 mm (range 0.0 – 5.8). The contact relationship between the laterals and centrals seems to be the most critical. relationship between the laterals and centrals seems to be the most critical. Forty rotated teeth in 21 patients were corrected more than 20 o. Mean Forty rotated teeth in 21 patients were corrected more than 20 o. Mean relapse during the first year postretention was 6.7 degrees (range 0.0-14.7). relapse during the first year postretention was 6.7 degrees (range 0.0-14.7). Mean changes during seven years were 8.2 degrees (range 0.0-19.3). Mean changes during seven years were 8.2 degrees (range 0.0-19.3). Conclusions: Conclusions: • Minor or no relapse in short-term follow-up (one year) was noted in the • Minor or no relapse in short-term follow-up (one year) was noted in the maxillary front after correction of irregularity and a two to four year maxillary front after correction of irregularity and a two to four year period of bonded retention. Further, small relapses occurred long-term period of bonded retention. Further, small relapses occurred long-term i.e. at mean seven years postretention. i.e. at mean seven years postretention. • No significant relation was found between the amount of correction of • No significant relation was found between the amount of correction of contact point displacement and magnitude of relapse neither in one nor contact point displacement and magnitude of relapse neither in one nor seven years postretention.
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